How Our Article Numbers Are Structured?

Example:

Item number: 93388znunc14x112

This number shows how the product is precisely specified:

1. The first three digits – DIN standard

The first three digits of the item number indicate the form according to DIN standard. Examples:

• 125SAE = standard washers
• 125USS = large washers
• 127 = spring washers
• 934 = hex nut high form
• 936 = hex nut low form
• 982 = lock nut high form
• 985 = lock nut low form
• 1587 = cap nut
• 91260 = socket head cap screws
• 7991 = countersunk screws with socket head
• BTN = button head socket screws
• 931 = hex bolt with partial thread
• 933 = hex bolt with full thread
• 7985 = slotted screws
• 911 = socket head cap screws

The DIN standard helps identify the type and form of the screw – important for correct selection and ordering.

2. The next two digits – strength class

88
Indicates strength class 8.8, equivalent to Grade 5 in the imperial system.

Note: Relevant only for bolts (DIN 931 / 933) and nuts (DIN 934). Socket head screws (e.g., DIN 912) always have a comparable grade of 12.9, so this is omitted in the item number.

3. Material / surface

zn
Indicates whether the part is zinc-coated or stainless steel:

• zn = zinc-coated
• a2 = stainless steel (A2)

4. Thread type

unc
Indicates the type of thread:

• UNC = coarse thread
• UNF = fine thread

5. Thread diameter

14
Represents the diameter in inches without fractions. Here: 14 = 1/4 inch.

6. Separator x

Clearly separates diameter and length.

7. Length

112
The length is indicated as a number without points or fractions. Here: 112 = 1 1/2 inches (1.5").

Why is this helpful?

Understanding how the item number is structured allows targeted product